Section 3.1 Addition and Subtraction of Like Fractions 169 Mixed Exercises For Exercises 45–56, add or subtract as indicated. Write the answer as a fraction or whole number. 14 5 2 5 1 21 13 21 7 8 5 8 45. 46. 47. 48. 14 15 2 15 4 15 20 35 12 35 6 13 7 13 49. 50. 51. 52. 19 12 5 12 7 12 8 3 2 3 1 3 7 2 3 2 1 2 53. 54. 55. 56. 5 3 19 6 7 18 2 3 11 6 13 18 5 6 5 18 Concept 2: Order of Operations For Exercises 57–68, simplify the expression by using the order of operations. Write the answer as a fraction or whole number. (See Example 3.) 5 4 3 2 5 6 a7 3 5 3 3 b a11 10 2 10 2 b 57. 58. 59. 60. 3 7 13 14 10 3 2 3 5 3 6 5 7 5 4 5 61. 62. 63. 64. 17 30 1 2 2 7 15 a17 30 12 30 b 5 6 a 2 21 11 21 b 1 7 65. 66. 67. 68. Concept 3: Applications of Addition and Subtraction of Fractions For Exercises 69 and 70, find the perimeter. (See Example 4.) 69. 70. 20 9 ft 23 9 ft 11 9 ft 5 7 5 m 7 m 2 7 m 1 7 13 6 5 12 2 21 5 18 1 2 5 2 3 1 6 71. Find the perimeter of the stamp. 72. Find the perimeter of the top of the table. 4 3 yd 8 3 yd 13 16 in. 15 16 in. 73. Gabby mixed gal of red paint with gal of 74. Emeril mixed cup balsamic vinegar with white paint. She used gal of the mixture to cup oil to make a salad dressing. Then he paint a room. How much mixture was left over? used cup of the mixture for a large salad. (See Example 5.) How much oil and vinegar mixture was left over? 18 4 8 3 10 3 8 7 10 1 10
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